学士后java集合框架和泛型习题答案

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1、packageentity;//学生类，属性为：姓名、性别、分数、年龄、班级publicclassStudent{privateStringname;privateStringgender;privateintscore;privateintage;privateStringclasses;publicStudent(Stringname^Stringgender^intscore,Stringclasses){this・name=name;this・gender=gender;this.score=score;this.classes=

2、classes;}publicStudent(Stringname，Stringgenderintage?intscore)this・name=name;thiSegender=gender;this.age=age;this.score=score;publicStuden^(Stringname,intscore){this・name=name;this.score=score;}publicStudent(Stringname){this・name=name;}protectedStringgetName(){returnname

3、;}protectedvoidsetName(Stringname){this>name=name;protectedintgetAge(){returnage;}protectedvoidsetAge(intage){this.age=age;}protectedStringgetGender(){returngender;}protectedvoidsetGender(Stringgender){this・gender=gender;}protectedintgetScore(){returnscore;}protectedvoids

4、etScore(intscore){this.score=score;}protectedStringgetClasses(){returnclasses;}protectedvoidsetClasses(Stringclasses){this.classes=classes;}}第二题答案源码及运行效果截图:packageentity;importjava.util.HashMap;importjava・util・Scanner;publicclassHomework2{publicstaticvoidmain(String[]args

5、){HashMapstudents=newHashMap

6、2);students・put("张无忌",stu3);students.put("赵敏”,stu4);System・out.println(M请输入学生姓名：H);Stringkey=input・next();if(students・containsKey(key)){Studentstu=students.get(key);System.out・println(stu・getName()+"的成绩是:H+stu.getScore());}System.out・println(M所有学生的成绩是”)；for(Objectvalue:st

7、udents・values()){Studentstu=(Studerit)value;System.out.println(stu・getName()+"的成绩是:"+stu.getScore());}请输入学生姓名:杨过杨过的成绩是：95所有学生的成绩是杨过的成绩是：95小龙女的成绩是：99赵敏的成绩是：90张无忌的成绩是：88第三题答案源码及运行效杲截图:packageentity;importjava・util・*;publicclassHomeworks{publicstaticvoidmain(String[]args){Li

8、stcStudent〉listl=newArrayList();Listlist2=newArrayList();List